<template>
  <div>
    <!-- 表格 -->
    <el-table :data="courseList" border stripe>

      <el-table-column label="#" width="50">
        <template slot-scope="scope">
          {{ (pageNum - 1) * pageSize + scope.$index + 1 }}
        </template>
      </el-table-column>

      <el-table-column label="封面" width="200" align="center">
        <template slot-scope="scope">
          <img :src="scope.row.cover" alt="scope.row.title" width="100%">
        </template>
      </el-table-column>
      <el-table-column label="课程信息">
        <template slot-scope="scope">
          <a href="">{{ scope.row.title }}</a>
          <p>
            分类：{{ scope.row.subjectParentTitle }} > {{ scope.row.subjectTitle }}
          </p>
          <p>
            课时：{{ scope.row.lessonNum }} /
            浏览：{{ scope.row.viewCount }} /
            付费学员：{{ scope.row.buyCount }}
          </p>
        </template>
      </el-table-column>
      <el-table-column label="讲师" width="100" align="center">
        <template slot-scope="scope">
          {{ scope.row.teacherName }}
        </template>
      </el-table-column>
      <el-table-column label="价格(元)" width="100" align="center" >
        <template slot-scope="scope">
          <!-- {{ typeof '0' }}  {{ typeof 0 }} {{ '0' == 0 }} -->
          <!-- {{ typeof scope.row.price }}
          {{ typeof Number(scope.row.price) }}
          {{ typeof Number(scope.row.price).toFixed(2) }} -->

          <el-tag v-if="Number(scope.row.price) === 0" type="success">免费</el-tag>

          <!-- 前端解决保留两位小数的问题 -->
          <!-- <el-tag v-else>{{ Number(scope.row.price).toFixed(2) }}</el-tag> -->

          <!-- 后端解决保留两位小数的问题，前端不用处理 -->
          <el-tag v-else>{{ scope.row.price }}</el-tag>
        </template>
      </el-table-column>
      <el-table-column prop="status" label="课程状态" width="100" align="center" >
        <template slot-scope="scope">
          <el-tag :type="scope.row.status === 'Draft' ? 'warning' : 'success'">{{ scope.row.status === 'Draft' ? '未发布' : '已发布' }}</el-tag>
        </template>
      </el-table-column>
      <el-table-column label="发布时间" width="140" align="center">
        <template slot-scope="scope">
          {{ scope.row.publishTime ? scope.row.publishTime.substr(0, 16) : '' }}
        </template>
      </el-table-column>

      <el-table-column label="操作" width="210" align="center">
        <template slot-scope="scope">

          <el-button type="text" icon="el-icon-edit" @click="handleUpdate(scope.row.courseId)">修改</el-button>

          <el-button type="text" icon="el-icon-delete" @click="removeById(scope.row.courseId)">删除</el-button>
        </template>
      </el-table-column>
    </el-table>
    <!-- 分页组件 -->
    <el-pagination
      :current-page="pageNum"
      :total="total"
      :page-size="pageSize"
      :page-sizes="[3, 4, 5, 7, 10]"
      style="padding: 30px 0; text-align: center;"
      layout="total, sizes, prev, pager, next, jumper"
      @size-change="changePageSize"
      @current-change="changeCurrentPage"
    />
  </div>
</template>
<script>
import courseApi from '@/api/course'
export default {
  data() {
    return {
      pageNum: 1,
      pageSize: 3,
      searchObj: {},
      courseList: [],
      total: 0
    }
  },
  created() {
    this.getCourseInfoList()
  },
  methods: {
    handleUpdate(id) {
      // 跳转到course/form页面：并在第一步页面中根据id查询课程信息回显
      // /course/save/${id}   必须存在路由映射： /course/save/:cid
      this.$router.push(`/course/save?id=${id}`)
    },
    getCourseInfoList() {
      courseApi.getCourseInfoList(this.pageNum, this.pageSize, this.searchObj).then(res => {
        this.courseList = res.data.page.records
        this.total = res.data.page.total
      })
    },
    changePageSize(size) {
      this.pageSize = size
      this.getCourseInfoList()
    },
    changeCurrentPage(page) {
      this.pageNum = page
      this.getCourseInfoList()
    }
  }
}
</script>
